Threading-tool.



vJ. M. CARPENTER.

THEEADING TOOL.

APPLICATION FILED FEB. 17, 1911.

Patented Jan. 30, 1912.

W/TNESSES ATTORNEYS COLUMBIA PLANOGRAPH co..\v^sHlNToN. D. cA

UNITED STATES .PATENT oEErcE.

THREADING-TOOL.

Specication of Letters Patent.

Application filed February 17, 1911.

Patented Jan. 30, 1912.

serial No. 609,079.

To all whom t may concern.'

Be it known that I, JAMES M. CARPENTER, a citizen of the United States,and a resident of Pawtucket, in the county of Providence and State ofRhode Island, have invented a new and Improved Threading-Tool, of whichthe following is a full, clear, and eXact description.

My invention relates to threading tools, and particularly to anattachment for tools of that description, by means of which the stock,that is, the shank of the bolt or other article to be threaded, is, heldin proper relation to the die of the tool in order to prevent the threadfrom being cut obliquely or skewed, when the tool is used.

The attachment referred to comprises a guide bar which is adjustablyheld in position across the forward or working face of the threadingtool, and which is formed with a number of transverse perforationspassing therethrough, these perforations being of different diameters tofit the size of the stock or bolt that is to be worked. Since the guidebar is adjustable, as stated above, any one of the transverseperforations can be brought into alinement with the central bore of thedie in which the cutter blades or knives for fashioning the threads areformed, and held in such alined relation. The dies being interchangeableor adjustable to suit the diameter of the bolt or other article to bethreaded, the guide bar thus forms an eiicient guiding means for anysize of stock on which the tool is to be used. -It will be understoodthat each passage through the guide bar will have the same diameter asthe bolt in connection with which it is to be used, so that, whether thedie actually employed in the threading tool be designed to lit largestock or small stock, or be adjustable to fit various sizes of stockthere will'be a guide passage in the guide bar of a diameter tocorrespond therewith. Heretofore it has been customary to employ for asimilar purpose a number of interchangeable washers arranged to lbe heldin alinement with the central bore of the die by means of a suitablesupport attached to the frame or body of the tool. These washers weremade of equal outside diameters but of different inside diameters inorder to fit the different sizes of bolts and the like on which the toolwas to be used. These washers were made removable so that they could beinterchangeable, according to the size of stock that Was to be worked,but

I as these washers were necessarily of small size it was hard to keepthem from getting lost or misplaced, with resulting inconvenience anddelay.

By means of my improved guiding attachment for threading tools, theabove disadvantages are obviated, as I am enabled to use but a singlepiece and at the same time secure all the adjustments that are requiredin practice.

Reference is to be had to the accompanying drawings forming a part ofthis specilication, in which the same characters of reference indicatethe same parts in all the views.

Figure 1 is a bottom plan; Fig. 2 is a side elevation of one form of myimproved therefor; Figs. 3 and 4 are similar views of a modified form;and Fig. 5 is an end elevation of the modification shown on Figs. 3 and4.

My threading tool comprises a central frame or body l, in which isremovably mounted a die of the usual type, which may be of adjustablediameter, if desired, indicated by the numeral l. At each end of theframe 1 is formed a raised boss or bearing 2, having alined perforationsto receive a bar 3, the ends 4 serving as handles. The central portionof this bar 3 is indicated by the numeral 3', and is held in suchposition by means of the bosses 2 that it lies centrally across theforward or working face of the die l. This central portion has a numberof transverse perforations 7, which pass through it from one .side tothe other. These perforations are of different diameters and arepreferably arranged in the same plane. The numeral 8 indicates a similarnumber of perforations, which pass through the central portion 3 of thebar 3,'in a direction different from the first series of perforations ortransverse passages 7. The largest of the passages or perforations 7 isshown at the left on Fig. 1, and the largest of the passages orperforations 8 is shown at the right; hence, by passing from left toright along the top of the bar 3, with the bar in the position shown onFigs. l and 2, and then from right to left along the side of the bar,one takes in the entire range or series of perforations and passagesfrom the largest to the smallest. The bar 3 is held in adjustableposition by means of a screw 9, or other threading tool with the guidingattachment suitable means, passing through the frame or body 1 from vanysuitable position. This bar is both longitudinally and rotatably mountedin the bearings 2, so that it can be moved from right to left, or turnedaround 5 its longitudinal aXis to bring any one of the openings 7 or 8in alinement withthe central bore 5 of the die, to suit the size of thestock or bolt to be worked. The die 1. is, of

course, chosen according to the requirements 10 of-working conditions,and is held in place in the frame 1 by means of a screw 10, or othersuitable means.

I preferably arrange the axes of the holes 7 in one plane and the axesof the holes 8 in another plane which may makel any suitable angle withthe first plane. In this way I am enabled to form a comparatively largenumber Aof holes over a short length'of bar, and

it is not necessary, in order to utilize my attachment, to increase thesize of the tool,

orV otherwise makeV it unsuitable or clumsy for use. Y

Init-he modification shown on Figs. 3 and 4, the frame 1 has a pair ofhandles 4 proijecting therefrom at its opposite ends.

These handles may be made integral with the frame, or may be otherwiseattached thereto; and the guide bar 3 is formed as a separate piece andsupported in the bearings or bosses 2 in the ends of the frame l out ofthe plane of the handles 4. The openings 7 andvfS pass through the sidesof the guide j^ bar 3, the planes of the two pairs of openings being atright-angles to each other, as

shown in Figs. 1 and 2. In this form I make the guide bar 3 square incross-section, and the perforations in the bosses 2 are correspondinglyshaped. 9 is a binding screw passing through the frame 1 and en- 40gaging the side of the guide bar 3 within one of the bearings 2, to holdthe guide bar 3 in its adjusted position.

Referring Ltoy the form shown on Figs. 1 and 2, I may make the bar 3round, as shown, Yor I may make it square or polygonal in cross-section.I. may also vary the relative location of the transverse passages f 7and V8, as it is not necessary that these openings should be formed soas to lie in two different planes, as shown andL described. Any relativearrangement which will allow of a sufhcient number of these openings tobe formed within a comparatively short length of bar will do; or I mayeven arrangel these openings in such a way that their outer ends willlie on a spiral passing around the outside surface of the handle 3, ifdesired.

In the form shown on Figs. 3, 4 and 5, it

i is obvious that I may give the bar 3 any reholds-true with regard tothemodication shown on the first two figures, as I do not care torestrict myself to a round bar if a bar of a different shape should benecessary.

It is to be observed that the holes 7 form one group, the members ofwhich are arranged longitudinally of the bar; and that the holes 8 formanother group, the members of which are also arranged longitudinally ofthe bar. These two groups form a single series of holes; and the membersof the group 7 decrease in size in passing longitudinally of the bar inone direction; while the members of the group 8 decrease in size inpassing along the bar in the opposite direction.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. A threading tool comprising a frame containing a die, and a guide barheld crosS- wise adjacent the forward or working face of the die, saidguide bar having a plurality of transverse passages of differentdiameters through it, said passages being arranged in different radialand in different transverse planes, to permit a considerable number ofpassages to be formed in a comparatively short length of bar, said barbeing adjustable both longitudinally and rotatably with respect to saiddie, to bring any one of said passages into alinement with the bore ofthe die.

2. A threading tool comprising a frame containing a, die, and ay guidebar held crosswise adjacent the forward or working face of the die, saidguide bar having a plurality of transverse passages of differentdiameters through it, part of said passages forming a group, the membersof which are arranged longitudinally of said bar, and the remainder ofsaid passages forming another group, t-he members of which are alsoarranged longitudinally of said bar, the end members of one group beingformed adjacent the corresponding end members of the other group, saidbar being adjustable both longitudinally and rotatably with respect tosaid die, whereby any one of said passages can' be rought into alinementwith the bore of the 3. A threading tool comprising a frame containingVa die, and a guide bar held crosswise -adjacent the forward or workingface of the die, said guide bar having a series of transverse vpassagesof different diameters through it, said passages being arranged inpairs, the axes of the members of each pair intersecting each other,said bar being adjustable longitudinally and rotatably with respect tosaid die, whereby any one of said passages can be brought into alinementwith the bore of the die.

4. A threading tool comprising a frame containing a die, and a guide barheld crosswise adjacent to the forward or working face of the die, saidguide bar having a series of transverse passages of dierent dianietersthrough it, the axes of part of said passages lying in one plane, andthe axes of the remainder of said passages lying in another plane, eachof the passages in one plane intersecting one of the passages in theother plane, whereby a considerable number of said passages can beformed in a comparatively short length of said bar, said bar beingadjustable longitudinally and rotatably with respect to said die,whereby any one of said passages can be brought into alinernent with thebore of the die.

In testimony whereof I have signed my 15 name to this speoiication inthe presence of two subscribing witnesses.

JAMES MORTIMER CARPENTER.

Witnesses:

VERONICA F. WALSH, HENRY A. GREENE.

Copies of this patent may be obtained for ve cents each, by addressing'the Commissioner of Patents,

Washington, D. G.

